大连一次沙尘天气的遥感研究  

Remote Sensing Study of a Dust Event over Dalian

作　　者：郭本军[1] 贺千山[2] 李成才[3] 毛节泰[3] 辛跳儿[2] 陈希壮[1] 李红斌[1] 黄艇[1] 宋煜[1] 

机构地区：[1]大连市气象局,辽宁大连116011 [2]上海市气象局,上海201100 [3]北京大学物理学院大气科学系,北京100871

出　　处：《南京气象学院学报》2008年第5期624-632,共9页Journal of Nanjing Institute of Meteorology

基　　金：大连市气象局域2006-2007年度多轨道业务建设资助项目;上海市气象局研究型专项(YJ200701)

摘　　要：利用中韩合作沙尘暴监测项目的微脉冲激光雷达（micro pulse lidar，MPL）观测了2005年11月6日影响大连的一次沙尘天气过程。MPL观测发现，影响大连的沙尘气溶胶层位于1～2km高度，厚度达1km，层内最大消光系数高达1．08km^-1，占整层气溶胶光学厚度（aerosol optical depth，AOD）的47％，接触到地面后可使地面消光系数达到0．23km^-1。沙尘气溶胶层与气象要素的垂直分布密切相关，整层的相对湿度很低。沙尘气团影响时地面空气动力学直径小于10μm的粒子质量浓度（PM10）达到峰值1678．9μg·m^-3，PM10的时间变化与MPL反演的近地面消光系数相当一致．两者之间的转换系数在1．94到6．50mg·m^-3·km^-1之间.A dust event that passed over Dalian （ 38.90 ° N, 121.63 ° E） on November 6,2005 has been observed by a micro-pulse lidar （MPL） of China-Korea cooperative Dust Monitoring Program. It is found that the dust layer extended upwards from 1 to 2 km above the ground level, with a peak extinction coefficient of 1.08 km^- 1. Additionally, the aerosol optical depth （AOD） of this dust air mass accounts for 47% of that for the whole air column. The extinction coefficient on the ground surface increased to 0.23 km^-1 when the dust entered to the atmospheric boundary layer in Dalian. The dust aerosol layer related closely with the vertical distribution of the meteorological parameters which was characterized by lower RH associated with the arid condition in desert area. The mass concentration of PM10 increased to 1 678.9 μg/m^3 when the dust air mass affected Dalian, which is in good agreement with the temporal evolution of the ground extinction coefficient retrieved from the MPL data. The conversion scale between the mass concentration of PM10 and the ground extinction coefficient varied in the range of 1.94 to 6.50 mg · m^-3 · km^-1.

关 键 词：微脉冲激光雷达 沙尘气溶胶 消光系数 垂直分布 

分 类 号：P407.5[天文地球—大气科学及气象学]